Ishigami may have gotten away with slacking off for a while but Medaka runs a right ship on her student council so you can bet that it would be stopped pretty quickly. She doesn’t mind having a little fun though and ultimately would be able to maximize Ishigami’s usefulness to the group. It’s why she’s a terrific boss but in a fight he stands absolutely no chance. He would be getting crushed the moment that the fight started. Medaka Kurokami wins.